import re
from django_redis import get_redis_connection
from rest_framework import serializers
from users.models import User


class RegisterUserSerializer(serializers.ModelSerializer):
    password2 = serializers.CharField(label='校验密码', allow_null=False, allow_blank=False, write_only=True)
    sms_code = serializers.CharField(label='短信验证码', max_length=6, min_length=6, allow_null=False, allow_blank=False,write_only=True)
    allow = serializers.CharField(label='是否同意协议', allow_null=False, allow_blank=False, write_only=True)

    token = serializers.CharField(read_only=True)

    class Meta:
        model = User
        fields = ['id', 'username', 'password', 'mobile', 'password2', 'sms_code', 'allow','token']
        extra_kwargs = {
            'id': {'read_only': True},
            'username': {
                'min_length': 5,
                'max_length': 20,
                'error_messages': {
                    'min_length': '仅允许5-20个字符的用户名',
                    'max_length': '仅允许5-20个字符的用户名',
                }
            },
            'password': {
                'write_only': True,
                'min_length': 8,
                'max_length': 20,
                'error_messages': {
                    'min_length': '仅允许8-20个字符的密码',
                    'max_length': '仅允许8-20个字符的密码',
                }
            }
        }

    def validate_mobile(self, value):

        if not re.match(r'1[3-8]\d{9}',value):
            raise serializers.ValidationError("手机号格式不正确")

        return value

    def validate_allow(self, value):

        if value != 'true':
            raise serializers.ValidationError('您未同意协议')
        return value

    def validate(self,attrs):

        password = attrs.get("password")
        password2 = attrs.get("password2")
        if password != password2:
            raise serializers.ValidationError("密码不一致")

        sms_code =attrs.get("sms_code")
        mobile = attrs.get("mobile")

        redis_conn =get_redis_connection("code")
        redis_sms_code = redis_conn.get('sms_%s' % mobile)

        if redis_sms_code is None:
            raise serializers.ValidationError('验证码过期')

        if redis_sms_code.decode() != sms_code:
            raise serializers.ValidationError('验证码不正确')

        return attrs

    def create(self, validated_data):

        del validated_data['sms_code']
        del validated_data["allow"]
        del validated_data["password2"]

        # user = User.objects.create(**validated_data)
        user = super().create(validated_data)

        #修改密码
        user.set_password(validated_data.get("password"))
        user.save()

        from rest_framework_jwt.settings import api_settings

        jwt_payload_handler = api_settings.JWT_PAYLOAD_HANDLER
        jwt_encode_handler = api_settings.JWT_ENCODE_HANDLER

        payload = jwt_payload_handler(user)
        token = jwt_encode_handler(payload)

        user.token = token

        return user


class UserCenterInfoSerializer(serializers.ModelSerializer):

    class Meta:
        model = User
        fields = ['id','username','email','mobile','email_active']


class EmailUpdateSerializer(serializers.ModelSerializer):

    class Meta:
        model = User
        fields = ['email']

        extra_kwargs = {
            'email': {'required': True}
        }


from .models import Address


class AddressSerializer(serializers.ModelSerializer):

    # 序列化的时候使用
    province = serializers.StringRelatedField(read_only=True)
    city = serializers.StringRelatedField(read_only=True)
    district = serializers.StringRelatedField(read_only=True)

    #反序列化的时候使用
    province_id = serializers.IntegerField(label='省ID', required=True)
    city_id = serializers.IntegerField(label='市ID', required=True)
    district_id = serializers.IntegerField(label='区ID', required=True)

    mobile = serializers.RegexField(label='手机号', regex=r'^1[3-9]\d{9}$')

    class Meta:
        model = Address
        exclude = ('user', 'is_deleted', 'create_time', 'update_time')


    def create(self, validated_data):

        user = self.context['request'].user
        validated_data['user'] = user

        address = super().create(validated_data)

        return address


class AddressTitleSerializer(serializers.ModelSerializer):
    """
    地址标题
    """

    class Meta:
        model = Address
        fields = ('title',)



from goods.models import SKU
from django_redis import get_redis_connection

class UserHistroySerializer(serializers.Serializer):
    """
    添加用户浏览记录序列化器
    """
    sku_id = serializers.IntegerField(label='商品编号',min_value=1,required=True)

    def validate_sku_id(self,value):
        """
        检查商品是否存在
        """
        try:
            SKU.objects.get(pk=value)
        except SKU.DoesNotExist:
            raise serializers.ValidationError('商品不存在')

        return value

    def create(self, validated_data):

        #获取用户信息
        user_id = self.context['request'].user.id
        #获取商品id
        sku_id = validated_data['sku_id']
        #连接redis
        redis_conn = get_redis_connection('history')
        #移除已经存在的本记录
        redis_conn.lrem('history_%s'%user_id,0,sku_id)
        #添加新的记录
        redis_conn.lpush('history_%s'%user_id,sku_id)
        #保存最多5条记录
        redis_conn.ltrim('history_%s'%user_id,0,4)
        return validated_data


class SKUSerializer(serializers.ModelSerializer):

    class Meta:
        model = SKU
        fields = ('id', 'name', 'price', 'default_image_url', 'comments')